ABC News Special: One on One With President Biden

Meet the Browns, a seemingly regular family on the outside, but with a twist once you step inside their home. We also learn this extraordinary family is on the verge of another huge change that could transform the family’s dynamic forever.

Kody heads south to court his potential fourth wife, Robyn. Meanwhile back home, the wives express their true feelings about their new possible sister wife as they make preparations for Christine’s new baby.

Kody and his teenage daughters throw a birthday party for his new fiancee, Robyn. Meanwhile, first wife Meri struggles with feelings of jealousy as the whole Brown clan moves Robyn and her anxious kids closer to the family home.

Kody's fiancee Robyn helps out with the kids while Kody and his pregnant third wife Christine go to the hospital. A week overdue, they must make an important decision on whether or not to induce labor.

While the three wives buy a friendship ring for Kody's fiancee Robyn, Kody prepares to celebrate his 20th Anniversary with his first wife, Meri. But when nothing goes as planned, will Kody end up in the dog house?

As the wedding day nears, the three wives help fiancee Robyn pick a wedding dress, a cake and a venue for their unique polygamist wedding reception. Meanwhile, it’s Janelle’s birthday, and Kody has a special trip planned just for the two of them.

The big day is finally here! Follow Kody and his wives as they make Robyn officially wife number four. See this extraordinary family as they celebrate the newest additions to their family and prepare to embark on a new chapter in their lives.

NBC's Natalie Morales sits down with the Browns from TLC's smash hit Sister Wives for a candid discussion about love, marriage, jealousy and what the future may hold.

Kody and new wife Robyn are off on their honeymoon, spending time surfing and visiting a nearby zoo. Meri, Janelle and Christine stay back home with the kids, but will they have a hard time coping while Kody is away?